4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vlad Tsyrklevich <v...@tsyrklevich.net>
commit 30f939feaeee23e21391cfc7b484f012eb189c3c upstream.
i2c_smbus_xfer() does not always fill an entire block, allowing
kernel stack memory disclosure through the temp variable. Clear
it before it's read to.
Signed-off-by: Vlad Tsyrklevich <v...@tsyrklevich.net>
Signed-off-by: Wolfram Sang <w...@the-dreams.de>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/i2c/i2c-dev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -331,7 +331,7 @@ static noinline int i2cdev_ioctl_smbus(s
unsigned long arg)
{
struct i2c_smbus_ioctl_data data_arg;
- union i2c_smbus_data temp;
+ union i2c_smbus_data temp = {};
int datasize, res;
if (copy_from_user(&data_arg,
